CN108131324A - A kind of small-sized multi-wing centrifugal exhaust fan of highly effective low noise and impeller - Google Patents
A kind of small-sized multi-wing centrifugal exhaust fan of highly effective low noise and impeller Download PDFInfo
- Publication number
- CN108131324A CN108131324A CN201810036683.4A CN201810036683A CN108131324A CN 108131324 A CN108131324 A CN 108131324A CN 201810036683 A CN201810036683 A CN 201810036683A CN 108131324 A CN108131324 A CN 108131324A
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- China
- Prior art keywords
- impeller
- exhaust fan
- blade
- small
- low noise
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
- F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
Abstract
The embodiment of the invention discloses a kind of impeller of the small-sized multi-wing centrifugal exhaust fan of highly effective low noise, by making blade twist and layback so that impeller blade inlet angle is gradually changed according to axis direction, and blade interior flowing is more reasonable；It is thickeied by blade bottom, increases blade strength and stability, while increased exit angle, reduce outlet flow size, increase outflow wind speed and wind pressure；To improve flowing and reducing the reflux between hub disk and spiral case gap, hub disk is changed to band conical ring by circular ring shape.This secondary design improves runner characteristic, reduces percussion of the impeller blade to air-flow, reduces noise and reduces loss.
Description
Technical field
The present invention relates to a kind of exhaust fan more particularly to a kind of small-sized multi-wing centrifugal exhaust fans of highly effective low noise.
Background technology
With the fast development of China's economic, science and technology, the improvement of people's living standards, Chinese household electrical appliances market is also a day crescent
Different, exhaust fan is more and more widely used in every profession and trade, and consumer is also more next to the quality parameter requirement of exhaust fan
It is higher, it is desirable to which that exhaust fan meets low noise, high efficiency, small requirement in the case where meeting flow.These parameters
Between there are corresponding relations.Multi-wing centrifugal exhaust fan is due to the advantages of its pressure coefficient is high, discharge coefficient is big, small, at present
It has been used as exhaust fan for household preferred configuration.
It is still not perfect at present since wind turbine is theoretical, the description of blower interior flow field complicated difficult, particularly small-sized centrifugation exhaust fan
Design tend to rely on empirical data.Traditional Design Method of Fan is the functional requirement according to product, designer according to
Experience proposes designing scheme, and the side of providing is analyzed and tested, and seeks final feasible program according to product requirement.
The performance parameter (flow, wind pressure, noise and efficiency) of wind turbine depends primarily on the through-flow quality of fan passage, multiple wing
It is by gas guide vane wheel that centrifugal blower mainly partly forms current collector effect by current collector, impeller, spiral case three；Impeller is main
To air work, motor impeller to air work；Spiral case mainly plays gas collection, guiding, diffusion action, and passes through snail
Shell Surface Radiation Noise.Wherein impeller parameters influence centrifugation exhaust fan the most key, (high including impeller boss ratio, width
Degree), blade diameter, inlet and outlet established angle, number of blade etc..
At present studies in China worker most study be also impeller performance parameter to compressor flow, pressure, noise, efficiency
Influence.Because impeller, volute shape are complicated, die sinking cost of manufacture is high, wherein most research be all based on theoretical research or
Person passes through software analog simulation by establishing flow equation.Most of impeller is using Theoretical Design formula currently on the market,
But because ventilation blower type is extensive, there are many subdivision types one species ventilation blower, theoretical calculation formula is simultaneously endless
It is complete to be applicable in.Much the blade of centrifugation exhaust fan is designed to single circular arc prismatic blade currently on the market.Blade passage be air-flow from
Air inlet should make blade shape some changes, to reduce to the key position of gas outlet transition according to the difference of different operating modes
Aerodynamic noise and energy loss.
Invention content
Technical problem to be solved of the embodiment of the present invention is, provides a kind of highly effective low noise small-sized multi-wing centrifugal exhaust
Fan.Exhaust fan can be made more to meet confusor channel, reduce noise, improve efficiency.
In order to solve the above-mentioned technical problem, an embodiment of the present invention provides a kind of small-sized multi-wing centrifugal exhausts of highly effective low noise
The impeller of fan, including blade, blade forward position direction is reversed and swings back along direction along rear, and the windup-degree is 8~12,
Reclined by angle is 2~6.
Further, the inlet angle of the blade is in arc structure.
Further, the angular range of the inlet angle of the blade is 40~50.
Further, the angular range of the angle of outlet of the blade is 165~175.
Further, the interlobate runner distance is 6mm~8mm.
Further, the blade root chassis chamfers 6~12 jiaos.
Further, the blade arc radius is：
Wherein, D2For impeller outer diameter, D1For profile ID, β2For the angle at impeller outlet angle, β1Angle for impeller eye angle
Degree, R1For impeller inside radius, R2For impeller outer radius.
Further, the impeller center arc radius is
Further, the blade upper semisection torsion and layback, lower semisection draft thickeies and layback.
The embodiment of the invention also discloses a kind of small-sized multi-wing centrifugal exhaust fans of highly effective low noise, and that includes said programs
Impeller.
Implement the embodiment of the present invention, have the advantages that：By the present invention in that the blade twist and layback of impeller, make
Impeller blade inlet angle is obtained to gradually change according to axis direction；It is thickeied by blade bottom, not only increases blade strength with consolidating
Property, while increase exit angle, reduce outlet flow size, increase outflow wind speed and wind pressure.This secondary design improves runner spy
Property, percussion of the impeller blade to air-flow is reduced, noise is reduced and reduces loss.
Description of the drawings
Fig. 1 is the structure diagram of the cross section of the blade of the present invention；
Fig. 2 is the overall structure diagram of the blade of the present invention；
Fig. 3 is the structure diagram of the wheel bottom beveling of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
Step ground detailed description.
With reference to structure diagram shown in FIG. 1.
The impeller of the small-sized multi-wing centrifugal exhaust fan of a kind of highly effective low noise of the embodiment of the present invention, including provided circumferentially about
Blade.
The air-flow of exhaust fan is come in from current collector, into wheel chamber, enters blade passage by blade forward position, finally from
It moves along the runner for out entering impeller and spiral case after blade and is flowed out through outlet.In the entire flow process of air-flow, air-flow
Speed is an aggregate velocity, and speed, direction are changing always, such as following formula：
Wherein,It is air velocity vector,It is air velocity along impeller axial component,It is that air velocity is all along impeller
To componentIt is air velocity along impeller radial component.
Air-flow does not enter before current collector, and the circumferential speed of air-flow varies less, and circumferential speed is close to current collector edge
There are many place variation, close to the local very little in axle center and variation it is little, the main speed of air velocity is axial velocity at this time.Air-flow
Into current collector, circumferential speed, radial velocity start to increase, and the place variation closer to blade forward position is faster.Therefore, gas
Air velocity, direction when stream enters blade passage axially change always, and this requires the inlet angle β of blade1
It is the process of a variation in an axial direction.It is small circumferential speed when air-flow enters impeller is just started, inlet angle β1Can more greatly, it can be with
So that air-flow preferably enters blade passage.Circumferential speed becomes larger in an axial direction, and air-flow becomes smaller to the angle of attack of blade, inlet angle
β1Accordingly become smaller to reduce impact of the air-flow to blade, as shown in Figure 1.
In order to solve the above-mentioned technical problem, it is swung back by blade twist and blade, blade twist angle is about 80 degree~120
Degree is more suitable (the present embodiment is preferably 100 degree of blade twist angle), more suitable (this reality in 20 degree~40 degree of the elevation angle after blade
It is preferably 30 degree of the elevation angle after blade to apply example), as shown in Figure 2.
(it is 70mm to be equal to impeller height h) to vane overall length degree H, and impeller inlet is effectively through-flow, and width is about width of blade
0.75.Blade is segment design, and 50~60mm (taking 55mm) reverses 10 ° along direction of rotation at upper semisection 3/4, is swung back 3 °, such as
Fig. 2.25mm thickeies (draft thickeies, 1 ° of drafting angle) using prismatic blade at lower semisection 1/4, swings back 3 °.The blade of the present embodiment
In addition to reversing, swinging back, also vane inlet skew back is cut, structure diagram as shown in Figure 2.
Consider exhaust fan overall dimensions problem, reduce installation dimension to the greatest extent under equal flow, pressure to reach, drop simultaneously
Low noise.The outer diameter D of impeller2Take Φ 126mm, internal diameter D1102mm is taken, internal diameter compares D with outer diameter1/D2=0.81.Impeller height h=
(0.4-0.6)D2, take h=70mm, angle of outlet β2=170 °, inlet angle β1=42 °.
Blade arc radius is：
Impeller center arc radius is
In order to lengthen the acceleration channels of blade exit, correspondingly blade inlet runner is shortened, and is ensured again sufficiently large
Angle of outlet β2And inlet angle β1, therefore, by changing blade arc radius RkAnd impeller center arc radius R0, respectively Rk=
6.3mm, R0=55.4mm, as shown in Figure 1.Blade has thickness, takes vane thickness t=1mm, then blade arc outer diameter Rk'=
7.3mm.Width (width of flow path) t=(0.7~1.2) R between impeller bladek, small impeller blade takes t=1.1Rk, then leaf
The piece number z=π * D1/ t=42.
Traditional impeller blade inlet is using sharp-cornered entrance, such that when air-flow is into air stream enter runner, acute angle
Notch causes air-flow massive separation, can generate noise and energy loss.The improved blade of the present invention, is replaced sharp with aerofoil profile circular arc
Angle kerve, so that it is smooth that air-flow enters blade passage process, reduces air-flow and acutely breaks up, reduces noise and energy loss.
More optimizedly, in order to prevent from impeller come out gas from below impeller hub disk gap flow back impeller internal, this reality
Apply in example hub disk is designed it is tapered, with conventional disk into 8~12 ° of angles, 10 ° of this implementation optimized angle, such as Fig. 3, dash area
It is cut-out.After excision, the gap in impeller domain is tapered into from impeller center toward edge by 10 °.
The embodiment of the present invention replaces acute angle, using twist blade, layback leaf in impeller blade inlet using aerofoil profile circular arc
Piece, the beveling of impeller chassis can be effectively increased exhaust fan flow 1%~3%, reduce the noise of 0.5dB~3dB.And pass through improvement
Good blade is compared with original common blade, and flow improves 8%~10%, and noise reduces 2dB~3dB.The impeller of the present invention
Exhaust fan can effectively promote its overall performance.
Certainly the above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow be familiar with technique
People can understand present disclosure and implement according to this, it is not intended to limit the scope of the present invention.It is all according to this hair
The modification that the Spirit Essence of bright main technical schemes is done, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of impeller of the small-sized multi-wing centrifugal exhaust fan of highly effective low noise, which is characterized in that including blade, the blade forward position
Direction is reversed and swings back along direction along rear, and the windup-degree is 8~12, and reclined by angle is 2~6.
2. the impeller of the small-sized multi-wing centrifugal exhaust fan of highly effective low noise according to claim 1, which is characterized in that the leaf
The inlet angle of piece is in arc structure.
3. the impeller of the small-sized multi-wing centrifugal exhaust fan of highly effective low noise according to claim 2, which is characterized in that the leaf
The angular range of the inlet angle of piece is 40~50.
4. the impeller of the small-sized multi-wing centrifugal exhaust fan of highly effective low noise according to claim 3, which is characterized in that the leaf
The angular range of the angle of outlet of piece is 165~175.
5. the impeller of the small-sized multi-wing centrifugal exhaust fan of highly effective low noise according to claim 4, which is characterized in that the leaf
Runner distance between piece is 6mm~8mm.
6. the impeller of the small-sized multi-wing centrifugal exhaust fan of highly effective low noise according to claim 5, which is characterized in that the leaf
It takes turns root chassis and chamfers 6~12 jiaos.
7. the impeller of the small-sized multi-wing centrifugal exhaust fan of highly effective low noise according to claim 6, which is characterized in that the leaf
Piece arc radius is：
Wherein, D2For impeller outer diameter, D1For profile ID, β2For the angle at impeller outlet angle, β1For the angle at impeller eye angle, R1
For impeller inside radius, R2For impeller outer radius.
8. the impeller of the small-sized multi-wing centrifugal exhaust fan of highly effective low noise according to claim 7, which is characterized in that the leaf
Wheel center arc radius is
9. the impeller of the small-sized multi-wing centrifugal exhaust fan of highly effective low noise according to claim 7, which is characterized in that the leaf
Piece upper semisection reverses and layback, and lower semisection draft thickeies and layback.
10. a kind of small-sized multi-wing centrifugal exhaust fan of highly effective low noise, which is characterized in that including such as any one of claim 1-9 institutes
The impeller stated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810036683.4A CN108131324A (en) | 2018-01-15 | 2018-01-15 | A kind of small-sized multi-wing centrifugal exhaust fan of highly effective low noise and impeller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810036683.4A CN108131324A (en) | 2018-01-15 | 2018-01-15 | A kind of small-sized multi-wing centrifugal exhaust fan of highly effective low noise and impeller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108131324A true CN108131324A (en) | 2018-06-08 |
Family
ID=62399793
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810036683.4A Pending CN108131324A (en) | 2018-01-15 | 2018-01-15 | A kind of small-sized multi-wing centrifugal exhaust fan of highly effective low noise and impeller |
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| CN (1) | CN108131324A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109505801A (en) * | 2018-12-25 | 2019-03-22 | 海信(广东)厨卫系统有限公司 | Asymmetric both sides air inlet impeller, centrifugal blower and kitchen ventilator |
| WO2022077585A1 (en) * | 2020-10-13 | 2022-04-21 | 宁波方太厨具有限公司 | Impeller, centrifugal fan using impeller, and rangehood |
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